EIA_608 captions do not work on NVIDIA

When recording TV shows and selecting the captions file, NVIDIA shield freezes up for a few seconds to load but then nothing is displayed.

When Plex Server runs from Windows 10 machine captions work fine. Seems to be some bug in NVIDIA?

So it seems to be a player issue. Same recordings work perfectly fine in Windows 10.

So having NVidia shield as media server, Windows 10 Plex player works fine

NVidia shield as media server and NVidia shield Plex player doesn’t work